Synthesis of ethyl acetate by esterification of acetic acid with ethanol over a heteropolyacid on montmorillonite K10

Gurav, Hanumant; Bokade, Vijay V.

doi:10.1016/s1003-9953(09)60048-7

Cited by 41 publications

(27 citation statements)

References 15 publications

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“…49 Also, a study of this reaction with the same 2:1 molar ratio, using 30 wt.% H 3 PW/montmorillonite K10 under approximately similar experimental conditions of our report, yielded 90% ethyl acetate, but at 8 h reaction. 50 The behavior of the higher yield with excess of acetic acid was consistent to other mechanism studies in the literature. 51 It has been proposed a single-site mechanism (Eley-Riedel) in which the adsorbed carboxylic acid reacts with the alcohol (methanol or ethanol) in both gas/liquid-phase, describing the kinetics very satisfactorily.…”

Section: Resultssupporting

confidence: 78%

Acidity and Characterization of 12-Tungstophosphoric Acid Supported on Silica-Alumina

Mattos¹,

Carvalho²,

Freitas³

et al. 2016

Journal of the Brazilian Chemical Society

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This work deals with preparation and characterization of H 3 PW 12 O 40 (H 3 PW) supported on silica-alumina. Impregnation of H 3 PW (15, 20, 30 and 40 wt.%) on commercial silica-alumina support in acidic aqueous solution is effective for preparing this catalyst keeping its Keggin structure, according to different methods of characterization. The catalysts were tested in a model reaction of acetic acid with ethanol and 30 wt.% H 3 PW/SiO 2 -Al 2 O 3 had the highest activity under the conditions: catalyst calcination at 300 °C, temperature of 100 °C, acetic acid:ethanol molar ratio of 2:1 and catalyst:acetic acid mass ratio of 10 wt.%. The reaction yield was 79 and 100% selectivity for ethyl acetate over three reutilizations, for reaction time of 2 h. The calculated total acid site distribution was 0.299 mmol g -1 (97% of the theoretical probed by pyridine), and most of these (0.236 mmol g -1 ) were Brønsted weak-medium strength (pyridine desorption between 300 and 500 °C).

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Section: Resultssupporting

confidence: 78%

Acidity and Characterization of 12-Tungstophosphoric Acid Supported on Silica-Alumina

Mattos¹,

Carvalho²,

Freitas³

et al. 2016

Journal of the Brazilian Chemical Society

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“…Because of low specific area (\10 m 2 /g) and dissolution in polar solution, heteropolyacid is not easy to separate from the reaction mixture and its catalytic reaction stability is poor [11]. Through supporting heteropolyacid on SiO 2 [12,13] and other carries [14][15][16][17], or anchoring it on supports modified by organic functional groups [18][19][20], some stable heteropolyacid catalysts are obtained in many references. With the complete or partial substitution of different counter cations for protons, its leaching could also be prevented.…”

Section: Introductionmentioning

confidence: 98%

Calcium Salts of Tungstophoric Acid Supported on Silica as Novel Catalysts for Tetrahydrofuran Polymerization

et al. 2011

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The 12-tungstophoric acid (HPW) and its calcium salts Ca x/2 H 3-x PW 12 O 4 with the calcium content in the range 0 \ x \ 3 supported on silica were synthesized, and their catalytic properties were also studied in the polymerization of tetrahydrofuran under mild conditions. These catalysts were characterized by isothermal nitrogen adsorption/desorption, infrared spectroscopy, n-butylamine electrometric titration, and thermal analysis. The calcium salts presented strong acidity and high catalytic performance. When x = 2.0, the supported calcium salt CaH-PW 12 O 40 /SiO 2 calcined at 300°C gave the highest catalytic activity. However, a poor catalytic activity was only obtained over the Ca 1.5 PW 12 O 40 /SiO 2 catalyst substituting all protons of phosphotungstic acid, which was due to its weakest acidity. The CaHPW 12 O 40 /SiO 2 sample showed better reusability than normal HPW/SiO 2 catalyst, and reacted as a recyclable and effective catalyst for tetrahydrofuran polymerization.

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“…Different heterogeneous catalysts were tested in the esterification of acetic acid with ethanol and 2-propanol, including carbon materials [6,7], zeolites [4,5,8], aluminophosphates [9], mesoporous solids [10], heteropolyacids [11][12][13] also including group five elements [12], montmorillonite [14] or resins [15][16][17]. However, because of the nature of esterification processes the very high yield of ester is limited by reaction equilibrium.…”

Section: Introductionmentioning

confidence: 99%

Esterification processes based on functionalized mesoporous solids

2015

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Synthesis of ethyl acetate by esterification of acetic acid with ethanol over a heteropolyacid on montmorillonite K10

Cited by 41 publications

References 15 publications

Acidity and Characterization of 12-Tungstophosphoric Acid Supported on Silica-Alumina

Acidity and Characterization of 12-Tungstophosphoric Acid Supported on Silica-Alumina

Calcium Salts of Tungstophoric Acid Supported on Silica as Novel Catalysts for Tetrahydrofuran Polymerization

Esterification processes based on functionalized mesoporous solids

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